Joint for connecting movable members of typewriters or the like



Mamh 1H0), W360 H. BENT KING 29@3339@@5 JOINT FOR CONNECTING MOVABLEMEMBERS OF TYP EWRITERS OR THE LIKE- Original F iled Dec. 1, 1933Patented Mar. 10, 1936 UETED STATES PATENT OFFIQE JOINT FOR CONNECTINGMOVABLE MEM- BEES OF TYPEWRITEES OR THE LIKE Hugo Benzing, Dresden,Germany, assignor to Aktiengesell'schaft vorm. Seidel & Naumann,

Dresden, Germany 12, 1935, Serial No. 10,709.

oember 10, 1932 3 Claims.

My invention relates to joints for connecting movable members oftypewriters or the like and more particularly to movable members formingpart of a shift mechanism of a typewriter, calculating machine or thelike as described in my copending application Serial No. 700,530, filedDecember l, 1933, now a patent, No. 2,008,383, of July 16, 1935, ofwhich this case is a division.

It is an object of my invention to provide a joint of the kind referredto which is devoid of play, but allows an adjustment for compensatingunavoidable differences which occur in the manufacture of the membersforming part of the apparatus or are due to wear.

In the drawing affixed to this specification andforming part thereofsome embodiments of my invention are illustrated diagrammatically by wayof example.

In the drawing Fig. 1 is an elevation of a shift mechanism of atypewriter in the operative position, said mechanism being provided withjoints according to my invention.

2 and 3 are elevations of two embodiments of joints according to myinvention.

Fig. 4 is a section according to the line 33 in Fig. 1.

Fig. 5 is a section of the joint shown in Fig. 3 according to the line4-4 in Fig. 3.

6 is a similar section as shown in Fig, 5 of a modified embodiment of myinvention.

In the frame I I of the machine there is mounted a frame 34. The arms ofthe frame 34 are engaged at M by links 35, the opposite ends of whichare pivoted at 40 to a type bar segment 3% which is actuated by means ofa pair of kneejoints 32, 33. The arm of the frame 34 is extended beyondthe pivot point 4|, and carries at its end a stud 44 engaged by thelower end of the knee-joint 32, the second joint portion of which issecured in permanent and rotatable fashion in a bearing 3i mounted onthe frame II of the machine. The middle joint portion 39 of theknee-joint 32 is engaged by the second kneejoint 33 with its one end,the opposite end of which is mounted in permanent and rotatable fashionin the bearing 36 on the machine frame II. The middle joint portion ofthis knee-joint is designated 33.

An important factor as regards faultless operation of the shiftmechanism when employing a system composed of two knee-joints is theproper embodiment of all pivot points and joints.

In Fig. 4 there is shown a possible form of embodiment of a bearing ofthis kind on enlarged In Germany Bescale such as may conveniently beemployed for the fixed bearing points 33 and 37. A block I2, which issecured in any suitable fashion to the frame I I of the machine,possesses an incision I3, so that there is formed a fork-like portion I4. In the part I 4 there is provided a stud 25. which is conical,tapered, part-spherical or also pointed at its end I6, and is shaped,for example, as a worm screw, which may be secured in the usual fashionby a nut IEa. The lever Iii to be mounted possesses a boring II, whichcorresponds with the end IQ of the stud I5 and engages with the same,the lever thus being securely mounted.

Figs. 5 and 6 show possible forms of embodiment for pivot points whichare not of a permanent kind, such as may be employed for example inconnection with the points 40, 4|, 44, and 38 (Fig. 5) and the point 39(Fig. 6). A yoke portion 20 encompasses with its two arms 26 the leversI8, I9 or 29 to be pivotally connected. The studs 25 provided in the twoarms 26 engage by means of their conical, tapered, part-spherical orpointed ends 24 the levers to be mounted on the outer faces incorresponding bores or recesses.

In Fig. 5 the one lever I8 is furnished with a stud 2| passing into abore 22 in the other lever I9. The lever I8 rests against the lever I9with a curvature 45 in order to prevent jamming in the joint if, forexample, owing to diiferences in the manufacture, the lever I9 does notswing exactly in the correct plane. According to Fig. 6, three leversare provided, of which the middle lever 29 possesses on either sidestuds 30, which engage in corresponding bores 22 in the adjacent leversI8, I9. These studs 2| and 30 in the case of weak levers are preferablyformed in a stamping operation by means of correspondingly shaped dies,which act simultaneously on both sides and are hollow at the centre forthe purpose of forming the studs. A shoulder 28 on one of the leverssupports the yoke 20, and thus prevents a swinging backwards andforwards and accordingly a disturbing noise.

These bearings offer advantage in various respects, particularly asregards large-scale production and manufacture on a moving belt. Thestuds may be produced by automatic machines without subsequentfinishing, and the levers are stamped with special tools in oneoperation; the new bearings nevertheless operate accurately, since in amanner of speaking the same are able to yield. Small differences in themanufacture, which are difficult to avoid, may be compensated byadjustment of the bearings. The adjustment may be performed readily asconsidered necessary, and after any wear which may take place thebearings may be tightened, whereupon the transmission will again occurwithout play. All the levers are flat, made of sheet steel and areeasily movable.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

I claim:

1. In a joint for levers made from sheet steel for use in shiftingmechanisms of typewriters, calculating machines, and the like, thecombination of an easily movable fiat lever, the thickness of whichbeing less than the diameter of the pivotal pins for said lever, andarranged in contact with each other, a U-shaped member comprising a pairof legs encompassing said movable levers, a stud forming a pivotal pinand arranged in a bore of one of said legs and having an end portion ofgradually decreasing diameter, said end portion engaging acorrespondingly shaped recess provided in that one of said movablelevers which is arranged adjacently to said leg provided with the boreand a stud forming part of the other movable lever and engaging acorrespondingly shaped bore in the first movable lever.

2. In a joint for connecting movable members forming part of a shiftmechanism of a typewriter, calculating machine or the like incombination two movable members, each having on its surface a curvedportion with which said members are arranged in contact with each other,a U-shaped member comprising a pair of legs encompassing said movablemembers and a stud arranged in a bore of one of said legs and having anend portion of gradually decreasing diameter, said end portion engaginga correspondingly shaped recess provided in that one of said movablemembers which is arranged adjacently to said leg provided with the bore.

3. In a joint for connecting movable members forming part of a shiftmechanism of a typewriter, calculating machine or the like incombination two movable members, each having on its surface a curvedportion with which said members are arranged in contact with each other,a U-shaped member comprising a pair of legs encompassing said movablemembers, a stud arranged in a bore of one of said legs and having an endportion of gradually decreasing diameter, said end portion engaging acorrespondingly shaped recess provided in that one of said movablemembers which is arranged adjacently to said leg provided with the bore,and a stud forming part of the other movable member and engaging acorrespondingly shaped core in the first movable member, said studs,said bore and said recess being arranged substantially in alignment witheach other and the curved portions of the surfaces of said movablemembers.

HUGO BENZING.

